热带气象学报2016，Vol.32Issue(5)：645-655,11.DOI:10.16032/j.issn.1004-4965.2016.05.007
超强不稳定和弱切变环境下一次飑线过程的雷达资料同化与分析
THE RADAR DATA ASSIMILATION AND ANALYSIS OF A SQUALL LINE UNDER ULTRASTRONG INSTABILITY AND WEAK VERTICAL WIND SHEAR
摘要
Abstract
With the mesoscale model WRF(Weather and Research Forecasting)and a corresponding 3DVar as-similation system,Doppler radar data in Wuhan are assimilated.Then,a squall line that formed in Hubei on July 26,201 1 is investigated by using the data assimilation results,NCEP FNL data,observed precipitation da-ta,radiosonde observations as well as observations of Doppler radars.The radiosonde observations show that the squall line is formed under the environment condition of weak low-level vertical wind shear and strong convective instability.The Doppler radar observations show two strong convective lines respectively in the directions of Northeast-Southwest and Northwest-Southeast;the first one moves slowly during its organization period,,the northwest side of the second one disappears rapidly and the southeast side merges into the first one.Diagnostic analysis by using the forecasts with assimilated radar data indicates that during the initial period,the dynamical condition is not beneficial to the formation and development of new convective cells,but the strong convective instability energy provides strong thermal lifting condition.Later on,low-level ambient vertical wind shear and a cold pool become in favor of development of the squall line,but dynamical lifting condition is weak and the con-vective instability energy still plays the vital role.With the increase of dynamical lifting and strong thermal lift-ing,the system gradually becomes mature.Finally,the convective instability energy releases,the strength of the cold pool becomes much stronger than the low-level vertical wind shear,and the squall line disappears.关键词
资料同化/多普勒雷达/飑线/对流不稳定/低层风垂直切变/冷池Key words
data assimilation/Doppler radar/squall line/convective instability/low-level vertical wind shear/cold pool分类
天文与地球科学引用本文复制引用
曹倩,张述文,曹帮军,叶丹,邱学兴..超强不稳定和弱切变环境下一次飑线过程的雷达资料同化与分析[J].热带气象学报,2016,32(5):645-655,11.基金项目
国家重点基础研究发展计划（973计划）（2013CB430102）；国家自然科学基金项目（41575098）；高等学校博士学科点专项科研基金项目（20120211110019）共同资助 （）
